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Other long-term liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Composition of other liabilities
As at
Dec 31
2020		Dec 31
2019
Cash flow hedges (note 19)
$180,798 $195,124 
Share-based compensation liability (note 14)
71,913 18,382 
Defined benefit pension plans (note 21)
36,646 28,121 
Site restoration costs
31,941 31,092 
Land mortgage
29,430 29,849 
Government grant construction obligation
— 3,173 
Other
3,915 6,582 
354,643 312,323 
Less current maturities
(27,152)(26,252)
$327,491 $286,071 
Provision for site restoration costs The movement in the provision during the year is explained as follows:
20202019
Balance at January 1
$31,092 $27,638 
New or revised provisions
423 2,638 
Accretion expense
426 816 
Balance at December 31
$31,941 $31,092